Lowest Prices

function solve(input) {
  const products = [];
  const cities = [];

  for (const info of input) {
    let [town, product, price] = info.split(' | ');
    price = Number(price);
    if (!products.includes(product)) products.push(product);
    const city = cities.filter(x => x.town == town)
    if (city.length == 0) {
      cities.push({town:town, [product]: price});
    } else if (!Object.keys(city[0]).includes(product)) {
      city[0][product] = price;
    } else {
      city[0][product] = price;
    }
  }

  for (const product of products) {
    let lowersPriceTown = cities.filter(x => Object.keys(x).includes(product)).sort((a, b) => a[product] - b[product]);
    (checkSamePrice(lowersPriceTown, product)) ? lowersPriceTown =  lowersPriceTown.sort((a, b) => cities.indexOf(a) - cities.indexOf(b))[0]
    : lowersPriceTown = lowersPriceTown[0];
    console.log(`${product} -> ${lowersPriceTown[product]} (${lowersPriceTown.town})`);
  }

  function checkSamePrice (arr, product) {
    for (let i = 0; i < arr.length - 1; i++) {
      if (arr[i][product] == arr[i + 1][product]) return true;
    }
    return false;
  }
}